Five stars for creating a much-needed bookmark search feature, last seen in the pre-Quantum "Go To Parent Folder" add-on. Its responsiveness is indeed somewhat slow, as noted by user Paul Jackson, below, yet the developer's answer is informative about the reason for this. Faster would be better, but having the functionality in the first place is what matters most at this time.

Thanks to user irripod for alerting me to this extension (by way of a comment for another add-on) and, most of all, to the developer for the good work. The developer's communicative engagement with users in this comment section is a further point of note.